I'm on Fast Ring. With minimal to moderate usage, for example when at work where I use the phone mainly to make calls or surf a little social stuff, the phone lasts me about 7-8 hours, coming down from 100 to 30 percent battery. I've gotten more than 12 hours on a similar usage pattern with battery save on all the time. All the above are on LTE dual sim.
Performance wise apps seem to open faster, run stable as compared tp previous builds, overall a more polished feel (same as when the anniversary update had arrived). I would say performance is as I would expect from this phone.
Taking photos and videos is better, my phone doesn't heat up when doing so. However, the phone does heat up when put om charging some times. Phone heating up is much less frequent than I remember (or I may have gotten used to it).
Using the phone as a hotspot or similar uses, like processor heavy games, or prolonged camera use will start to drain the battery fast - since the first scenario is project wifi signals, and the others use the screen a lot.
Windows hello / iris scanner works much better, faster and quite reliable. Even works from a farther distance, the improvement is quite noticeable.
In some of the earlier builds the connect page in settings used to crash upon opening, but works fine now.
All in all, if you are thinking of installing, it's a good build/update